Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2

Abstract

Critical points that can be suppressed to zero temperature are interesting because quantum fluctuations have been shown to dramatically alter electron gas properties. Here, the metal formed by Co doping the paramagnetic insulator FeS${}_2$, Fe${}_{1-x}$Co${}_x$S${}_2$, is demonstrated to order ferromagnetically at $x>x_c=0.01\pm 0.005$ where we observe unusual transport, magnetic, and thermodynamic properties. We show that this magnetic semiconductor undergoes a percolative magnetic transition with distinct similarities to the Griffiths phase, including singular behavior at $x_c$ and zero temperature.

arXiv comment10 pages, 4 figures

References in corpus (9)

• Non-Fermi liquid behavior and Griffiths phase in {\it f}-electron compounds
• Colossal Magnetoresistance is a Griffiths Singularity
• Observation of a Griffiths phase in paramagnetic La1-xSrxMnO3
• Non-Fermi Liquid Behavior in U and Ce Alloys: Criticality, Disorder, Dissipation, and Griffiths-McCoy singularities
• An experimental and computational investigation of structure and magnetism in pyrite Co${}_{1-x}$Fe${}_x$S${}_2$: Chemical bonding and half-metallicity
• Griffiths phase in diluted magnetic semiconductors
• On quantum Griffiths effects in metallic systems
• Magnetic Percolation and the Phase Diagram of the Disordered RKKY model
• Antisite effect on ferromagnetism in (Ga,Mn)As

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